Manifold pressure (MAP) and barometric sensor

What it means

The MAP sensor measures the pressure inside the intake manifold. From it the computer works out the engine load, and on many engines the amount of air coming in. These codes mean the signal is missing or does not make sense.

Codes in this group

Bank 1 is the side of the engine that has cylinder 1. Sensor 1 is before the catalytic converter and sensor 2 is after it. More terms explained.

What you may notice

• Rough idle
• Poor pick-up
• Black smoke or a smell of fuel
• Higher fuel use

Common causes

Most likely first:

• A cracked, loose or blocked vacuum hose to the sensor
• A vacuum leak at the intake manifold
• Damaged wiring or a loose plug
• A failed sensor

What to check first

• Look for split or disconnected small rubber hoses around the intake
• Listen for a hissing sound with the engine running
• Check the sensor plug

Have a mechanic confirm. A fault code tells you which system reported a problem, not which part has failed. The same code can have several causes, and they differ between car models. Use this page to understand the code, then have a qualified mechanic test the car before any part is replaced.

After the repair

Once the cause is fixed, the code can be cleared with a scan tool, or the warning light goes out by itself after several trips without the fault. Clearing a code without fixing the cause only hides it for a while. More about clearing codes.

Related codes

Mass air flow (MAF) sensor (P0100), Intake air temperature sensor (P0110), Engine coolant temperature sensor (P0115), Thermostat and engine warm-up (P0125), Throttle position sensor (P0120), Accelerator pedal sensor and throttle agreement (P2120), Electronic throttle actuator (P2100), Oxygen sensor before the catalytic converter (sensor 1) (P0130). All codes.

Written in November 2026. These are generic OBD-II codes, the same on all makes. Causes and repair steps differ between models.